Originally Posted by
Undefetter
If you did this, then you should be using purples/oranges/green gems. One of those stats is going to be the most useful for you. There is no reason to go flat Yellow in yellow slots, flat blue in blue slots and flat red in red slots. If spirit is more useful to you than crit, and int is than 2x as useful to you as spirit you should be going
Red: Int
Yellow: Int/Crit (unless the socket bonus is not enough to make up the big disparity between Int and Crit, in which case you would go flat Int)
Blue: Int/Spirit
At no point are you ever going to use more than 1 kind of flat gem. It may be you go flat Spirit, then in reds go Int/Spirit, and in yellows go Spirit/Crit or Flat Spirit based off the value of the socket, but in no situation would you go flat X and flat Y, let alone flat gems in all 3 socket types.